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The stone is an imperial unit of weight that was used widely in Europe until the metric system was introduced. Originally, the value weight of a stone varied according to area and the item being weighed. This changed in 1389 in England, when one stone of wool was determined to be equivalent to 14 lbs, according to Metric Conversions. Afterwards, this became the accepted standard weight of a stone. In Britain, stones are still used as a measurement of weight together with pounds.